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Practice with 1Z1-922 Dumps for Oracle MySQL Certified Exam Questions & Answer
NEW QUESTION # 92
Which two of the following are string datatypes in MySQL?
- A. CHAR
- B. INT
- C. VARCHAR
- D. BLOB
Answer: A,C
Explanation:
CHAR and VARCHAR are string datatypes in MySQL. CHAR is for fixed-length strings, and VARCHAR is for variable-length strings. BLOB is a binary large object, and INT is a numeric datatype.
NEW QUESTION # 93
Which command is used in MySQL Shell to create a new InnoDB Cluster?
- A. cluster.init()
- B. setupInnoDB()
- C. cluster.create()
- D. create.cluster()
Answer: C
Explanation:
The command cluster.create() is used in MySQL Shell to create a new InnoDB Cluster. This command initializes the cluster with the MySQL instances that will participate in replication and high availability.
NEW QUESTION # 94
Which of the following actions can MySQL Enterprise Audit log for compliance purposes?
- A. Changes to database schemas
- B. User login attempts
- C. Execution of specific SQL queries
- D. All of the above
Answer: D
Explanation:
MySQL Enterprise Audit logs user activities, including login attempts, schema changes, and SQL query executions, ensuring a detailed audit trail that supports compliance with security standards like GDPR or HIPAA.
NEW QUESTION # 95
Which two components are integral to the HeatWave architecture?
- A. Data nodes
- B. MySQL Query Cache
- C. HeatWave nodes
- D. MySQL Enterprise Backup
Answer: A,C
Explanation:
The HeatWave architecture includes HeatWave nodes, which process analytic queries, and data nodes, which store data for in-memory processing. These components work together to optimize query performance.
NEW QUESTION # 96
Which of the following backup strategies in MySQL ensures that backups are encrypted to protect sensitive data?
- A. Compressed backups using mysqlbackup
- B. Logical backups using mysqldump
- C. Binary log backups
- D. Encrypted backups using MySQL Enterprise Backup
Answer: D
Explanation:
MySQL Enterprise Backup supports encrypted backups, ensuring that sensitive data is protected during the backup process. This feature is essential for securing backups, especially when they are stored offsite or in the cloud.
NEW QUESTION # 97
Which of the following is a typical use case for performing incremental backups in MySQL?
- A. To back up a read-only database
- B. To reduce the amount of data that needs to be backed up by saving only the changes since the last backup
- C. To back up only the schema of the database
- D. To store backups on the local server
Answer: B
Explanation:
Incremental backups save only the data changes made since the last full or incremental backup, which helps reduce backup time and storage requirements, especially for large or frequently updated databases.
NEW QUESTION # 98
Which of the following best describes the MySQL Enterprise Audit plugin?
- A. A tool for managing database replication
- B. A feature that logs database activities for security and compliance auditing
- C. A backup and recovery solution for databases
- D. A tool for improving database performance
Answer: B
Explanation:
The MySQL Enterprise Audit plugin logs database activities, such as user logins, query execution, and schema modifications, providing a detailed audit trail for security and compliance purposes.
NEW QUESTION # 99
Which MySQL replication mode is most vulnerable to data loss in the event of a primary server crash?
- A. Semi-synchronous replication
- B. Multi-source replication
- C. Synchronous replication
- D. Asynchronous replication
Answer: D
Explanation:
Asynchronous replication is most vulnerable to data loss because the primary server does not wait for the replicas to confirm that they have applied changes. If the primary server crashes, there may be unreplicated transactions.
NEW QUESTION # 100
What makes HeatWave particularly suitable for real-time analytics?
- A. It reduces the size of the binary logs
- B. It executes queries directly in memory, avoiding disk I/O
- C. It optimizes transactional queries for consistency
- D. It stores query results on disk for future use
Answer: B
Explanation:
HeatWave is suitable for real-time analytics because it processes queries in-memory, which eliminates the need for disk I/O, significantly reducing query execution time for large datasets.
NEW QUESTION # 101
What is the purpose of the binary log in MySQL replication?
- A. To store changes made to the database
- B. To cache queries for faster access
- C. To store query results
- D. To back up data automatically
Answer: A
Explanation:
The binary log records all changes made to the database (such as updates, inserts, and deletes). These logs are used to replicate these changes to the replica servers.
NEW QUESTION # 102
What does automatic failover in a MySQL InnoDB Cluster mean?
- A. Automatically promoting a replica to the primary server if the primary fails
- B. Automatically switching to a backup database in case of a crash
- C. Automatically restarting the database after a crash
- D. Automatically rebalancing queries across the cluster
Answer: A
Explanation:
Automatic failover in MySQL InnoDB Cluster refers to the automatic promotion of a replica to the primary role when the original primary server fails, ensuring continuous availability.
NEW QUESTION # 103
Which two types of logs are essential for MySQL replication to function?
- A. Binary log
- B. Relay log
- C. General log
- D. Error log
Answer: A,B
Explanation:
The binary log records all changes made on the primary server, while the relay log on the replica stores the changes that need to be applied to the replica server. Both logs are essential for replication to function properly.
NEW QUESTION # 104
What does MySQL Router do in a MySQL InnoDB Cluster environment?
- A. It handles query optimization for replicas
- B. It performs automatic schema migrations
- C. It routes client connections to available MySQL server instances
- D. It stores database backups
Answer: C
Explanation:
MySQL Router is responsible for routing client connections to available and healthy nodes in the MySQL InnoDB Cluster. It helps ensure high availability by routing traffic to active servers in case of failure.
NEW QUESTION # 105
What is the default method to monitor replication lag in MySQL?
- A. Querying the Seconds_Behind_Master value from SHOW SLAVE STATUS
- B. Running SHOW PROCESSLIST on the primary server
- C. Checking the size of the binary log
- D. Enabling the Slow Query Log
Answer: A
Explanation:
The Seconds_Behind_Master value, available in the output of the SHOW SLAVE STATUS command, is the default method for monitoring replication lag in MySQL. It shows how many seconds the replica is behind the primary server.
NEW QUESTION # 106
What is the purpose of in-memory query execution in the HeatWave Cluster?
- A. To accelerate analytic queries by reducing disk I/O
- B. To reduce memory usage in large databases
- C. To enable replication across regions
- D. To optimize data storage on disk
Answer: A
Explanation:
In-memory query execution in the HeatWave Cluster accelerates analytic queries by reducing disk I/O, as the data is processed directly in memory rather than being read from disk, which speeds up query execution significantly.
NEW QUESTION # 107
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